Re: [PATCH 0/2] ARM64: perf: add support for the perf registers anddwarf unwinding

[Will Deacon]

On Thu, Nov 14, 2013 at 11:04:04AM +0000, Sandeepa Prabhu wrote:
> Hi Jean,
> 
> I have applied this patchset on aarch64 upstream branch,cross-compiled
> for arm64 and try running some tests for hardware breakpoints.
> 
> I cross-compiled perf using linaro toolchain
> "gcc-linaro-aarch64-linux-gnu-4.7-2013.04-20130415_linux" as
>  $ cd tools/perf/
>  $ make LDFLAGS=-static ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
> 
> Copied the static binary to my initrd image and tried running tests to
> place hw_breakpoint on an kernel symbol as:
> 
>  # perf record -e "mem:0xffffffc00013f640:x"

Right, but that's not a valid invocation of perf. You have to give it
something to record. Something like:

# perf record -e mem:0xffffffc00013f640:x -a -- sleep 10

for example.

Will
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